A transformer works by transferring energy from one magnetic winding to another by ___________.

• A. Capacitive Coupling
• B. Direct Contact
• C. Magnetic Induction
• D. Thermal Conduction

Answer: (C)

Magnetic induction is the mechanism by which a transformer transfers energy between windings. When alternating current flows in the primary, it creates a changing magnetic flux in the iron core that links both windings. This changing flux induces an electromotive force in the secondary according to Faraday’s law, with the voltage proportional to the turns ratio. Energy moves through the magnetic field rather than through direct electrical contact, preserving electrical isolation while delivering power to the load. Capacitive coupling would rely on electric fields and is not the primary energy transfer method in a transformer; direct contact would defeat isolation, and thermal conduction transfers heat, not electrical energy.